提供了在可能存在爆炸性气体环境的区域应用电阻跟踪加热系统的指南，0区除外。它为伴热设备及相关控制和监测设备的设计、安装、维护和维修提供了建议。它不包括通过感应加热、集肤效应加热或直接管道加热操作的设备，不包括用于消除应力的设备。

Provides guidance for the application of electrical resistance trace heating systems in areas where explosive gas atmospheres may be present, with the exception of those classified in zone 0. It provides recommendations for the design, installation, maintenance and repair of trace heating equipment and associated control and monitoring equipment. It does not cover devices that operate by induction heating, skin effect heating or direct pipeline heating, not those intended for stress relieving.